Clearly you have never experienced the horrors of the infamous 'S1 box' - complete with 'Robirch' pork pie. A pie which rattled if you shook it - for it contained one congealed lump of minced tail/trotter/tit and squeal inside its hard pastry cylinder.... Rather like a dice in a cup.
Or those sweaty cheese sandwiches which would probably explode if left next to a 100% oxygen source such as a mask knocked on to safety pressure by mistake.